#!/bin/bash

# Copyright (c) 2011-2014 Benjamin Fleischer
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
# 3. Neither the name of the copyright holder nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

# Requires common.sh
# Requires string.sh


function math_is_integer
{
    [[ "${1}" =~ ^-?[0-9]+$ ]]
}

function math_compare
{
    if (( ${1} < ${2} ))
    then
        return 1
    fi
    if (( ${1} > ${2} ))
    then
        return 2
    fi
    return 0
}

function math_max
{
    common_assert "math_is_integer `string_escape "${1}"`"
    common_assert "math_is_integer `string_escape "${2}"`"

    if (( ${1} > ${2} ))
    then
        printf "%s" "${1}"
    else
        printf "%s" "${2}"
    fi
}

function math_min
{
    common_assert "math_is_integer `string_escape "${1}"`"
    common_assert "math_is_integer `string_escape "${2}"`"

    if (( ${1} < ${2} ))
    then
        printf "%s" "${1}"
    else
        printf "%s" "${2}"
    fi
}
